JP2003176185A - Ceramic porous body and ceramic filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ceramic porous body which has high strength although the ceramic porous body has porosity and pore diameters approximately equal to those of a conventional ceramic porous body, and to provide a ceramic filter in which the ceramic porous body is used as a base material, a filter membrane or an intermediate layer and which realizes a long stable operation period while exhibiting the filtration accuracy (performance for preventing passage) and a standard filtration amount, approximately equal to those of the conventional ceramic filter. <P>SOLUTION: The ceramic porous body is obtained by sintering a raw material comprising at least an aggregate and a frit. The raw material of the ceramic porous body contains a fine aggregate. The preferable grain size of the fine aggregate is 1/2 to 1/20 of the grain size of the aggregate, and the preferable amount of the fine aggregate is 3 to 100 mass % to the mass of the aggregate. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a ceramic porous body and a ceramic filter using the same. More specifically, a ceramic porous body having improved strength, which is obtained by using a raw material to which fine aggregate and frit are added as a binder of aggregate, and obtained by sintering after molding, and a ceramic using the same. Regarding filters.

[0002]

2. Description of the Related Art Porous ceramic bodies are used, for example, as filters for solid-liquid separation or gas-solid separation. Ceramic filters, whose main component is a ceramic porous body, are superior in physical strength, durability, corrosion resistance, etc. compared to organic polymer membranes used for similar applications, and therefore water treatment and exhaust gas treatment. , Or in a wide range of fields such as pharmaceutical and food fields, suspended solids in liquids and gases, bacteria,
It is preferably used for removing dust and the like.

In a ceramic filter, a ceramic porous body may be used as it is as a filter medium, but in order to improve both filtration performance and fluid permeability, it is composed of a base material having a different average pore diameter and a filtration membrane. Is common. For example, the average pore diameter of the filtration membrane is 0.01
While it is configured to be as small as about 1.0 μm to ensure filtration performance, the average pore diameter of the substrate is configured to be large at about 1 to several 100 μm to reduce the flow resistance inside the substrate and improve the fluid permeation amount. Is being done.

Further, a ceramic filter is often used as a filter for crossflow processing. For example, in Japanese Unexamined Patent Publication No. 61-8106, as shown in FIG. 3, a seal portion 3 covers the end of the base material 1 and the filter membrane 2 near the end of the base material 1, and an O-ring 11 is formed. In addition, a filter suitable for cross-flow processing in which seal leakage is prevented is shown.

The cross-flow treatment is a filtration treatment in which a larger amount of circulating fluid to be treated is supplied than in the case of one-pass full filtration, and a fixed amount of it can be filtered, and since the flow velocity in the vicinity of the filtration membrane increases, It has the advantage that clogging is less likely to occur as compared with filtration. In the cross-flow treatment, the fluid to be treated is supplied into the flow passage from one end surface of the base material, and the filtered fluid that has passed through the filtration membrane on the inner surface of the flow passage is recovered from the outer peripheral surface side of the base material while being filtered. For the fluid to be treated, which was not collected, it was recovered from the other end surface side of the base material,
Circulate. Further, as shown in FIG. 2, a ceramic filter including an intermediate layer 5 between the filtration membrane 2 and the base material 1 is also known.

[0006] These ceramic filters have high reliability, have little corrosion even if they are washed with acid / alkali or the like due to their high corrosion resistance, and can precisely control the pore diameter that determines the filtering capacity. It has an advantage in being.

However, if such a ceramic filter is used for a long period of time for filtering a fluid, it will be contained in the fluid to be treated as the total filtration treatment amount increases, even if the filtration is carried out by a cross-flow treatment. Suspended matter,
In particular, it is unavoidable that organic suspended solids clogging the pores of the filter and impairing the permeability significantly.

Therefore, in order to remove the suspended matter and eliminate the clogging, the following is generally performed. (1) Backwash Contrary to the normal filtration process, the fluid permeation side of the filter (see FIG.
This is a cleaning process in which pressure is applied from the base material 1 side in (1) to the processed fluid supply side (filter membrane 2 side in FIG. 3). As a result, it is also preferable that the fluid flows from the fluid permeation side to the treated fluid supply side. This backwashing is generally, but not limited to, carried out to remove accumulated suspended substances in a short time, and is often carried out every several minutes to several hours between the filtration treatments. The suspended substance is returned to, for example, the treated fluid supply side and discharged to the outside of the system. (2) A chemical washing treatment using a chemical suitable for dissolving a chemical washing suspended substance, for example, an alkaline solution such as caustic soda, citric acid or sodium hypochlorite, and the like, but not limited to Often done to dissolve and remove suspended solids that have accumulated in the pores over time.

Conventionally, there has been a problem that when such backwashing and chemical washing are repeated, the filtration accuracy of the ceramic filter tends to gradually decrease. This is because the backwashing is often performed at a pressure higher than the filtration treatment when the bonding portion of the ceramic porous body is eroded by the chemical washing and the bonding strength is lowered, and thus the ceramic filter is formed by the pressure. It was presumed that the ceramic porous body was damaged, and as a result, the pore diameter of the ceramic porous body was increased.

Therefore, if the strength of the ceramic porous body constituting the ceramic filter is improved, the above problem is solved, and the backwashing and the chemical washing are repeatedly performed at a higher pressure, and the filtration accuracy is stable for a long period of time. The filtered treatment can be performed. There is no need to reduce the number of backwash and chemical washes, and it is easy to perform backwash or chemical wash urgently in consideration of situations such as an increase in differential pressure. The filtration amount at the reference pressure) is also unlikely to decrease. As described above, the ceramic filter composed of the ceramic porous body having excellent strength can exhibit stable performance for a long period of time.

Also, regardless of the problem of backwashing or chemical washing,
Even during the filtration process, if the concentration of suspended solids on the side of the fluid to be processed is high or if the suspended solids are hard and have an acute angle, the ceramic porous body will be damaged, and filtration for a long period of time will occur. Although a problem that the filtration process with stable accuracy cannot be performed may occur, this problem can be solved by improving the strength of the ceramic porous body forming the ceramic filter.

[0012]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances. And, the place to aim is, while having a porosity and a pore diameter almost the same as the conventional one,
It is to provide a ceramic porous body having more excellent strength, and further, the ceramic porous body is applied to a substrate, a filtration membrane, an intermediate layer, or the like to have a performance substantially equivalent to that of a conventional one. , That is, filtration accuracy (permeation blocking performance),
It is an object of the present invention to provide a ceramic filter which can realize a longer stable operation period while having a reference filtration amount. In order to solve the conventional problems, studies have been repeated on the porous ceramic body, and as a result of various studies, it has been found that the above object can be achieved by devising the raw material composition. More specifically, it is as shown below.

[0013]

[Means for Solving the Problems] That is, according to the present invention, there is provided a ceramic porous body obtained by sintering a raw material containing at least an aggregate and a frit, wherein the raw material contains fine aggregate. A porous ceramic body is provided.

In the present invention, the particle size of the fine aggregate is
It is preferably 1/2 to 1/20 of the particle size of the aggregate,
The content of the fine aggregate is 3% by mass or more and 100 with respect to the aggregate.
It is preferably not more than mass%. The fine aggregate is alumina, mullite, cordierite, silicon carbide,
It is preferably made of at least one ceramic contained in the material group consisting of silicon nitride and aluminum nitride.

Further, the particle size of the frit is preferably 1/2 to 1/20 of the particle size of the aggregate, and the content of the frit is 3% by mass or more and 40% by mass or less with respect to the aggregate. Is preferred. The frit includes feldspar, kaolin, alumina, silica, zirconia, titania, cordierite, calcia, magnesia, Na ₂ O, La ₂ O ₃ and Li _2.
It is preferable to use one kind of material or a mixed material of two or more kinds included in the material group consisting of O and K ₂ O.

Further, according to the present invention, there is provided a ceramic filter comprising at least a base material and a filtration membrane, wherein at least one of the base material and the filtration membrane comprises the above-mentioned ceramic porous body. Will be provided. The present invention also provides a substrate, a filtration membrane, and an intermediate layer, which are included in the ceramic filter and are made of the above-mentioned ceramic porous body. The average pore diameter of the base material is 1 to 500 μ.
The average pore diameter of the filtration membrane is preferably 0.01 to 1 μm, and the average pore diameter of the intermediate layer is preferably 0.1 to 5 μm.

Furthermore, according to the present invention, a small amount of aggregate having a particle size of 1/2 to 1/20 of the aggregate is used as the aggregate so that the minimum amount is 3% by mass and the maximum amount is 100% by mass. A frit having a particle size of 1/2 to 1/20 of that of the aggregate is mixed so as to be a minimum of 3% by mass and a maximum of 40% by mass of the aggregate to obtain a mixture, and then the mixture is molded to obtain a molded body. To get 900 ~ 15
Provided is a method for producing a ceramic porous body, which comprises sintering a molded body at 50 ° C.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION The ceramic porous body according to the present invention is obtained by sintering a raw material containing at least an aggregate and a frit, and in addition to the aggregate and the frit, fine-grained bone having a small particle size. It is characterized by including wood.

Conventionally, the raw material obtained by adding the frit to the aggregate and mixing it does not have the frit functioning as a binder, and the sintering is not performed at the sintering temperature of the aggregate or higher, which is necessary in the case of the aggregate alone. It is known that the binding strength of aggregate can be expressed by sintering at low temperature, but in the raw material in which frit is added to the aggregate and fine aggregate is further mixed, the frit is the binder. In addition, since the fine aggregates exist so as to enter the frit between the aggregates and fill the gaps between the aggregates, the strength is further increased under the same manufacturing conditions, and deterioration is less likely to occur.

A ceramic filter having such characteristics and configured by using various ceramic porous bodies having different average pore diameters has excellent strength, so that the concentration of suspended matter in the feed fluid to be filtered is high. Even if it is high or if the suspended matter contains a material having a hard and acute angle, it is possible to carry out the treatment without lowering the filtration accuracy. or,
For a ceramic porous body, it does not easily deteriorate even during backwashing or chemical washing, which is more severe,
It is possible to increase the frequency of backwashing and chemical washing depending on the situation. Therefore, according to the ceramic filter of the present invention, it is possible to realize a stable filtration treatment regardless of the supply fluid and without deterioration of the quality of the filtered fluid for a long period of time.

In the present specification, the particle size means the median diameter of a predetermined controlled particle size distribution. The median diameter refers to the median value of particle diameters. For the measurement, a laser diffraction / scattering particle size distribution measuring device LA-920 (manufactured by Horiba Ltd.) was used, a wet method using water as a solvent was adopted, and a relative refractive index of 1.30 and an ultrasonic dispersion of 1 were used. The measurement was performed under the condition of a minute (ultrasonic intensity was 7 on the maximum scale). Hereinafter, the present invention will be described in detail.

First, the ceramic porous body will be described. In the ceramic porous body of the present invention, the particle size of the fine aggregate is preferably 1/2 to 1/20 of the particle size of the aggregate. If it is larger than 1/2, it is difficult for the fine aggregate to exist between the aggregates and to exist, and it is difficult to increase the binding force of the frit, which is not preferable. If it is less than 1/20, the strength is lowered, which is not preferable.

In the ceramic porous body of the present invention,
The content of the fine aggregate is 3% by mass or more and 100 with respect to the aggregate.
It is preferably not more than mass%. In addition, for example, the content of the fine aggregate is 3 mass% with respect to the aggregate, which means that the mass ratio of the aggregate and the fine aggregate is 100: 3. If it is less than 3% by mass, the strength is lowered, which is not preferable. When it is more than 100% by mass, the porosity decreases when the frit content is constant, and the strength decreases when the aggregate content is constant, which is not preferable.

In the ceramic porous body of the present invention,
The fine aggregate is preferably made of at least one ceramic contained in the material group consisting of alumina, mullite, cordierite, silicon carbide, silicon nitride, and aluminum nitride. One kind or a mixture of plural kinds may be used and may be appropriately selected depending on the fluid to be contacted and the purpose of filtration. As the fine aggregate, it is also possible to suitably use, for example, crushed ceramic waste made of these ceramics,
A cheaper one may be adopted.

In the ceramic porous body of the present invention,
The particle size of the frit is preferably 1/2 to 1/20 of the particle size of the aggregate. If it is larger than 1/2, it is difficult for the frit to enter between the aggregates or the fine aggregates to enhance the bonding force between them, which is not preferable, and if it is smaller than 1/20,
This is not preferable because it is difficult to improve strength.

In the ceramic porous body of the present invention,
The content of the frit is preferably 3% by mass or more and 40% by mass or less with respect to the aggregate. If it is less than 3% by mass, the strength is lowered, which is not preferable. When it is more than 40% by mass, the frit fills the pores of the aggregate or the minute amount of aggregate, and the porosity decreases, which is not preferable.

In the ceramic porous body of the present invention,
The frit is one of the materials included in the material group consisting of feldspar, kaolin, alumina, silica, zirconia, titania, cordierite, calcia, magnesia, Na ₂ O, La ₂ O ₃ , Li ₂ O, and K ₂ O, or It is preferably composed of a mixed material of two or more kinds. One kind or a mixture of plural kinds may be used and may be appropriately selected depending on the fluid to be contacted and the purpose of filtration. The frit refers to a material that bonds and cross-links the aggregate, or a material that acts as a sintering aid for the aggregate and remains between the aggregates, and is obtained by melting and homogenizing the ceramics, then cooling and crushing. . The frit and the aggregate and the fine aggregate may be the same ceramic material or may be different.

Next, regarding the ceramic filter,
It describes including the manufacturing method. As illustrated in FIGS. 2 and 3, the ceramic filter according to the present invention includes at least the base material 1, the filtration membrane 2, and the seal portion 3 as constituent members.

The substrate 1 is a member having a function as a support of the filtration membrane 2, is made of a ceramic porous body, and preferably has an average pore diameter of 1 to 500 μm.
More preferably, the average pore diameter of the ceramic porous body is 5 to
It is 30 μm. The preferable shape of the base material 1 is a tube shape having a single flow passage, or a honeycomb shape or a monolith shape having a plurality of parallel flow passages.

The base material 1 is formed by sintering a raw material containing at least an aggregate, a fine aggregate and a frit. For example, the aggregate, the fine aggregate and the frit, and a molding aid such as an organic binder are formed. It can be obtained by obtaining a kneaded material obtained by kneading the agent and, if necessary, a surfactant and the like, extruding the kneaded material into a honeycomb shape or the like, drying and then sintering. The sintering temperature is preferably 1200 to 1550 ° C, and the sintering time at the maximum temperature is preferably 1 to 2 hours.

The filtration membrane 2 is a member having a filtering function of the ceramic filter, is a ceramic porous body formed on the substrate 1, and has an average pore diameter smaller than the average pore diameter of the substrate 1. It preferably has an average pore diameter of 0.01 to 1 μm. More preferably, the average pore diameter of the ceramic porous body is 0.1 to 0.5 μm.

The filtration membrane 2 is formed by sintering a raw material containing at least an aggregate, a fine aggregate and a frit. For example, the aggregate, the fine aggregate and the frit are dispersed in a dispersion medium such as water. If necessary, organic binder, pH adjuster,
It can be obtained by applying a film-forming slurry containing a surfactant, a defoaming agent and the like on the base material 1, preferably on the inner surface of the flow passage of the fluid to be treated, drying and sintering. The sintering temperature is preferably 900 to 1100 ° C., and the maximum temperature sintering time is preferably 1 hour. In the present invention, the filtration membrane formed on the base material and sintered includes the case where the filtration membrane 2 is directly applied to the surface of the base material 1 as shown in FIG. 3 and the case where it is shown in FIG. In both cases, the case where the filtration membrane 2 is applied to the base material 1 via the intermediate layer 5 is included.

As shown in FIG. 2, when the ceramic filter comprises the intermediate layer 5 between the filtration membrane 2 and the substrate 1, the intermediate layer 5 is preferably a ceramic porous body, and the filtration membrane 2 It can be formed by the same method as the filtration membrane 2 using the same material as. In this case, the average pore diameter of the intermediate layer 5 is preferably formed so as to be larger than the average pore diameter of the filtration membrane 2. The ceramic porous body used for forming the intermediate layer 5 preferably has a particle size of about 0.1 to 5 μm, more preferably about 1 to 3 μm.

Then, the ceramic porous body preferably has a particle size smaller than that of the ceramic porous body used for the base material 1. That is, by decreasing the average pore diameter in the order of the base material 1, the intermediate layer 5, and the filtration membrane 2, it becomes possible to maintain a good balance between the filtration performance and the treatment capacity.
It is also possible to configure the intermediate layer from two or more layers,
At this time, it is preferable that the average pore diameter be gradually decreased from the side of the substrate 1 toward the side of the filtration membrane 2.

The seal portion 3 is a member for preventing the fluid to be processed from entering the inside of the substrate 1 from the surface of the substrate 1, and a portion where the substrate 1 and the fluid to be processed may come into contact with each other. , Covering a part of the filtration membrane 2 in the vicinity thereof. In the embodiment of FIGS. 2 and 3, it is preferable that the end portion of the base material 1 and the filtration membrane 2 near the end portion of the base material 1 are covered with the seal portion 3. The seal portion 3 is formed by, for example, applying a sealant to a portion that needs to be sealed, for example, the end portion of the base material 1 and the vicinity thereof, and then sintering the seal material. The sintering temperature is preferably 900 to 1100 ° C., and the sintering time at the maximum temperature is preferably 1 hour.

[0036]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. Preparation of base material Aggregate made of alumina, silica 72%, alumina 17
%, K ₂ O 4.7%, magnesia 3.0%, calcia 2.0%, Na ₂ O 1.3% frit, and a raw material in which a fine aggregate of alumina was mixed was prepared. Then, the kneaded material obtained by kneading the raw material was passed through a die and extrusion-molded to obtain a molded body. The molded body is dried and then sintered at a predetermined temperature for 2 hours to form a base material 1 (Example 1), a base material 2 (Example 2), a base material 3 (Comparative Example 1), and a base material. 4 (Comparative Example 2) Substrate 5 (Comparative Example 3), Substrate 6 (Comparative Example 4), Substrate 7 (Comparative Example 5), Substrate 8 (Comparative Example 6), Substrate 9 (Comparative Example 7) Got The composition of each base material, the aggregate, the particle size of the fine aggregate and the frit, and the sintering temperature of each base material are as shown in Table 1. The shapes of the base materials 1 to 9 are thin rectangular parallelepipeds as shown in FIG. 1A, and the length L is 100 mm. The cross section has a vertical H of 8 m.
It is a rectangle with m and width W of 25 mm. The base materials 1 to 9 are formed by forming 13 cells 10 in the length L direction. Cell 10
Has a regular hexagonal cross section, as shown in FIG.
The length of one side S is 1.5 mm. Cell surface area is 9
It was 00 mm ² .

Substrate Specifications Table 1 shows the pore diameters (mercury intrusion method), porosity (mercury intrusion method), and strength of the first to ninth substrates. The strength (three-point bending strength) was measured by the method shown in FIG. FIG. 5 is a side view of the base material. The center part of the length L direction is the load point PF, and the support points are 40 mm on the left and right sides from the center part in the length L direction. The PS was placed, a three-point bending test was performed, and the load F when the test piece (base material) was broken was evaluated.

Evaluation of Base Materials Table 1 shows the standard water permeation rates of the base materials 1 to 9. The standard water permeability is
Distilled water was supplied as raw water at a pressure of 98 [kPa] and the amount of permeated water was measured, and the result was calculated at 25 ° C. under 1 atm.

Preparation of Filter Membrane Aggregate made of alumina and fine aggregate made of alumina were stirred and mixed, and then 69% silica, 16 zirconia
_{%, Na 2 O8%, K} 2 O3.2%, La 2 O 3 2.6%,
It was mixed with a frit consisting of 1.2% Li ₂ O and suspended in water to obtain a slurry. Using the obtained slurry, a film having a thickness of 150 to 200 μm is formed on substrates 10 to 15 made of the same material as the above-described substrate 1 and having different shapes, and sintered for 2 hours, Filter 1 as a porous membrane
(Example 3), Filter 2 (Example 4), Filter 3
(Comparative Example 8), Filter 4 (Comparative Example 9), Filter 5
(Comparative Example 10) and Filter 6 (Comparative Example 11) were obtained.
The composition of each slurry, the particle size of the aggregate, the fine aggregate and the frit, and the sintering temperature of the film are as shown in Table 2. The film-formed filters 1 to 6 were formed so as to have a columnar shape as shown in FIG. 4A, and the outer shape thereof was made to have a diameter D1 of 30 mm and a length L of 1000 mm. The filters 1 to 6 have cells 2 in the length L direction.
55 0s are formed. As shown in FIG. 4B, the cell 20 has a circular cross section, and its diameter D2 is φ2.3.
mm.

The specifications of the filtration membrane are shown in Table 2 and the pore diameters of the filters 1 to 6 (ASTM F306
The air flow method described) and strength are shown. The strength is represented by Vickers hardness. Vickers hardness is JIS Z
2244 "Vickers hardness test method" was used for measurement. The measurement conditions were room temperature, a load of 100 g, and a load holding time of 10 Sec.

Evaluation of Filters Table 2 shows the standard water permeation rates of the obtained filters 1 to 6. The standard water permeation amount was obtained by converting the permeated water amount by supplying distilled water as raw water at a pressure of 49 [kPa] and converting the permeated water amount at 25 ° C. and 1 atm.

[0042]

[Table 1]

[0043]

[Table 2]

According to Examples 1 and 2, by adding a preferable amount of the aggregate according to the present invention, the porosity, the pore diameter, and the reference water permeability are almost the same as those of Comparative Examples 1, 2, 6 and 7. A base material having higher strength was obtained, and Comparative Examples 3 to 5
It can be seen that a base material having a higher standard water permeability can be obtained. In addition, according to Examples 3 and 4, the filters formed with the film to which the preferable fine aggregate according to the present invention is added have the same pore diameter and the same standard water permeability as Comparative Examples 8 to 11. , It can be seen that the strength is higher.

The present invention relates to a ceramic porous body containing at least an aggregate and a frit and further obtained by sintering a raw material containing a fine aggregate, and a ceramic filter using the same. An object to be achieved by the present invention is to provide a ceramic porous body having a porosity and a pore diameter that are substantially the same as those of the conventional one, and showing an equivalent amount of water permeation while having more excellent strength.

Therefore, in the above-mentioned Examples and Comparative Examples, the conditions of the mixing balance of the aggregate, the frit, the fine aggregate and the sintering temperature are adapted to the purpose.
Then, the quality of the blending balance is confirmed by the reference filtration amount of the ceramic filter using the ceramic porous body thus blended.

[0047]

EFFECTS OF THE INVENTION According to the present invention, there is provided a ceramic porous body having a porosity and a pore diameter that are substantially the same as those of the conventional one, and having more excellent strength without impairing the amount of water permeation. Further, there is provided a ceramic filter formed by applying the ceramic porous body to a base material, a filtration membrane, an intermediate layer, or the like. It can be applied to a severe supply fluid and can exhibit stable performance for a longer period.

[Brief description of drawings]

FIG. 1 is a diagram showing a shape of a sample (base material) in an example, FIG. 1 (a) is a perspective view, and FIG. 1 (b) is an enlarged cross-sectional view of a cell formed on a base material. .

FIG. 2 is a view showing one embodiment of the ceramic filter according to the present invention, and is a schematic cross-sectional view of a state where the ceramic filter is mounted on a housing.

FIG. 3 is a view showing another embodiment of the ceramic filter according to the present invention, and is a schematic sectional view of the ceramic filter.

4A and 4B are diagrams showing a shape of a sample (filter) in an example, FIG. 4A is a perspective view, and FIG. 4B is an enlarged cross-sectional view of a cell formed in the filter.

FIG. 5 is a diagram illustrating a method of measuring strength (three-point bending strength) in Examples, and is a side view of a base material that is a test piece.

[Explanation of symbols]

1 ... Substrate, 2 ... Filtration membrane, 3 ... Seal, 5 ... Intermediate layer, 10
... cell, 11 ... O-ring, 12 ... housing, 20 ...
cell.

Claims (12)

[Claims] 1. A ceramic porous body obtained by sintering a raw material containing at least an aggregate and a frit, wherein the raw material contains fine aggregate. 2. The ceramic porous body according to claim 1, wherein the fine aggregate has a grain size of 1/2 to 1/20 of the grain size of the aggregate. 3. The ceramic porous body according to claim 1, wherein the content of the fine aggregate is 3% by mass or more and 100% by mass or less with respect to the aggregate. 4. The fine aggregate is alumina, mullite,
The ceramic porous body according to any one of claims 1 to 3, comprising at least one kind of ceramics contained in a material group consisting of cordierite, silicon carbide, silicon nitride, and aluminum nitride. 5. The ceramic porous body according to any one of claims 1 to 4, wherein the particle size of the frit is 1/2 to 1/20 of the particle size of the aggregate. 6. The ceramic porous body according to claim 1, wherein the content of the frit is 3% by mass or more and 40% by mass or less with respect to the aggregate. 7. The frit is feldspar, kaolin, alumina, silica, zirconia, titania, cordierite, calcia, magnesia, Na ₂ O, La ₂ O ₃ , Li ₂
O, ceramic porous body according to any one of claims 1-6 made of one material or a mixture of two or more materials included in the group of materials consisting of K ₂ O. 8. A ceramic filter comprising at least a base material and a filtration membrane, wherein at least one of the base material and the filtration membrane is ceramic porous according to any one of claims 1 to 7. Ceramic filter consisting of a solid body. 9. A base material for a ceramic filter, comprising the ceramic porous body according to claim 1, comprising at least a base material and a filtration membrane, and having an average pore diameter. A substrate for a ceramic filter having a thickness of 1 to 500 μm. 10. A filtration membrane for a ceramic filter, comprising the ceramic porous body according to claim 1 and comprising at least a base material and a filtration membrane.
A filtration membrane for a ceramic filter having an average pore diameter of 0.01 to 1 μm. 11. An intermediate layer for a ceramic filter, comprising the ceramic porous body according to claim 1 and comprising at least a base material, a filtration membrane and an intermediate layer, An intermediate layer for a ceramic filter having an average pore diameter of 0.1 to 5 μm. 12. A small amount of aggregate having a particle size of 1/2 to 1/20 of the aggregate is mixed with the aggregate to a minimum of 3% by mass and a maximum of 100% by mass of the aggregate, and the particle size is A frit that is ½ to 1/20 of the aggregate is mixed so as to be a minimum of 3% by mass and a maximum of 40% by mass of the aggregate to obtain a mixture, and then the mixture is molded to obtain a molded body. 900-1
A method for producing a ceramic porous body, comprising sintering the molded body at 550 ° C.